Dictionary

petitio principii

noun pe·ti·tio prin·ci·pii \pə-ˈtē-tē-ˌō-(ˌ)priŋ-ˈki-pē-ˌē\

Definition of PETITIO PRINCIPII

:  a logical fallacy in which a premise is assumed to be true without warrant or in which what is to be proved is implicitly taken for granted
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Origin of PETITIO PRINCIPII

Medieval Latin, literally, postulation of the beginning, begging the question
First Known Use: circa 1531

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